I have purchased this iMac and paid dearly for it but the previews do not Rez fast, if I use the arrow keys there is a little lag. I did uncheck to render RAW for previews but it isn't as fast as I had hoped.

I have attached a screenshot of my memory settings, hopefully that's what's wrong with it and I can fine tune the memory setting for PM?

I'm just viewing Sony a9's raws, so they are small files, on an average about 1500 of them. They ' are stored on the computer SSD.

I'd like to see your Photo Mechanic log. In Photo Mechanic go to the Help menu and choose "Reveal Support Data..." and moments later a Finder window will come forward with the zipped log file selected. Use the 'Attachments and other options' link when you're composing your reply to this message and there you'll be able to upload your zipped PM log file.

It not just the previews but even after changing a bunch of color classes to the thumbnails (via keyboard), after a while of doing it the spinning ball kicks in! This is more than 8k computer. I was hoping it'll be speeding through those operations but it clearly isn't. Hopefully when PM 6 will support multicore it'll be much faster.

It not just the previews but even after changing a bunch of color classes to the thumbnails (via keyboard), after a while of doing it the spinning ball kicks in! This is more than 8k computer. I was hoping it'll be speeding through those operations but it clearly isn't. Hopefully when PM 6 will support multicore it'll be much faster.

There are a number of exceptions occurring in your log. Did you reduce the Memory Cache size to 256MB?

Do you have a color profile assigned to your display? What macOS version are you using on your system?

What are the exceptions? Errors?

Essentially, yes. Looks like low memory conditions to me. Reducing the Memory Cache size should help. PM5 is a 32-bit application and as such can only use a maximum of 4GB of RAM, much of which is taken up by PM's application code, shared libraries, and data structures unrelated to the images themselves.

If reducing the Memory Cache to 256MB or even 128MB doesn't help then I suggest contacting our support folks at: